I'm not sure if the switch to Unreal Engine 5 is locked in or just in a testing phase for now, but the FAQs on the main website and the forums should probably be updated to reflect the (potential) engine change.
Hey there . I was a founder and fan of Firefall back early in it's development. I Just discovered this game a few days ago. It looks like I missed some early backer rewards, so thanks for giving some of us a chance to get some of the loot we missed.